3) Paper Feed Jam (Error 391: 1St Tray); Jam Occurs Immediately After The Power Is Turned On. (1St Tray); Jam Occurs Immediately After The Paper Feed Is Started. (1St Tray) - Oki MC860 Maintenance Manual

Oki Data CONFIDENTIAL

7.5.2.(3) Paper feed jam (error 391: 1st tray)

(3-1) Jam occurs immediately after the power is turned on. (1st tray)

Check item
(3-1-1) Check the condition of the paper running path
Paper running path Open the front cover check if paper is not
of the front unit jammed in the paper running path.
(3-1-2) Check condition of the mechanical parts
Check the sensor Check if shape and movement of the
levers of the paper sensor levers have any abnormality or not.
entrance sensor
1 and the paper
entrance sensor 2.
(3-1-3) Check condition of electrical parts
Check the detection Confirm that the sensor signals
condition of the are normally detected by using the
sensor signal. Maintenance Menu SWITCH SCAN
function.
Check output signal Check for the following signals at the FSNS
level of the paper connector number 16 of the PU PCB.
entrance sensor
Pin-4: Entrance sensor 1
1 and that of the
Pin-3: Entrance sensor 2
paper entrance
Confirm that the above signal levels change
sensor 2.
when the sensor lever is operated.
Check the power Check the 5V power at the FSNS connector
voltages supplied of the front sensor PCB (RSF PCB).
to the front sensor
Pin-7: 5V
PCB (RSF PCB)
Pin-5: 0VL
43967002TH Rev. 1
Check work Action to be taken at NG
Remove the
jammed paper.
Replace the sensor
lever with the good
sensor lever.
Replace either the
PU PCB or the front
sensor PCB (RSF
PCB) or connection
cable.
Replace the front
sensor PCB (RSF
PCB)
Replace the
connection cable.

(3-2) Jam occurs immediately after the paper feed is started. (1st tray)

Check item
(3-2-1) Check the condition of the paper running path
Paper running path Check if paper is jammed or not in the
of the front unit paper running path.
(3-2-2) Check condition of the mechanical parts
Check the sensor Check if shape and movement of the
levers of the paper sensor levers have any abnormality or not.
entrance sensor
1 and the paper
entrance sensor 2.
Check the separator Check if any foreign materials such as
assemblies of the paper dust on the surface of the feed roller
feed roller, the or of the pickup roller or not.
pickup roller and the
Check if the feed roller or the pickup roller
tray.
has worn out or not.
(3-2-3) Motor operation check
Paper feed motor Confirm that the paper feed motor works
normally by using the Motor & Clutch Test
of the self-diagnostic mode.
Paper feed motor Remove the HOPSIZE connector no. 1 of
driver the PU PCB and check the followings at
the connector side.
Several MΩ between pin1 – FG.
Several MΩ between pin1 – FG.
Several MΩ between pin1 – FG.
Several MΩ between pin1 – FG.
7. Troubleshooting
Check work Action to be taken at NG
Remove the
jammed paper.
Replace the sensor
lever with the good
sensor lever.
Remove the foreign
material.
Replace the
separator
assemblies of the
feed roller, pickup
roller and tray.
Replace the PU
PCB or paper feed
motor.
38. Paper feed
motor driver
PU PCB
replacement
327 /